Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60b69d2bef069ff…

MALICIOUS

PDF

70.2 KB Created: 2021-09-08 10:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 394d1bc01fa5908aaad28a0cd064582a SHA-1: 3486617b55bdb1ac323c73bbdfbcfcdb1be095bb SHA-256: f60b69d2bef069ffcb5b05d85297b60c5cdb7517bdee78fbee5ab3fabc5ff44e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as phishing-related. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=guide+des+maladies+infectieuses+et+parasitaires+pdf PDF link annotation
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613164c4da2af---85117681309.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/fotalovawosudoda.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/negosuvolaragoda.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//danizozipexuxop.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/65151246504.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2170325fa9094cdacfb4f0689c9e4cd7/teminipovusapumavedik.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/xakovonep.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///pafanuxowijoxa.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/tkonlbmlk5j70l1fo0ek1a37m8/51758660310.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/18723be42d07cac90895690e4a7965be/pedapometotobixabubogig.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/10189853181.pdfIn PDF document text
    • https://activepymes.com/pub/file/52648833611.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/bijamadadijekakaberoki.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/10004735224.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2afa6d06c4---80026409475.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/kulito.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/69098845321.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610f3d48423e2---mujesufaka.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f741d3b492f---tepumamot.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/gamin.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16102d6276e2bd---dasadotoz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4baa053552---fupoxiduwekonudosab.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DE 15140 bytes
SHA-256: 0f4546e7d97467d16f51067d6b45f293273e53d4826fc761e23e20839e60ce90
font_01_sfnt_off0000d996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 10800 bytes
SHA-256: feabd858db0b44f63a6105c8197373e545efe2d6cf3d06d943cfe05e1e4d46b9

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